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江苏句容盆地继下青龙组(T_1x)碳酸盐岩产层中发现自生自储的低—中等成熟度原油之后,又在上覆上青龙组(T_1s)见到未成熟的碳酸盐生油岩。这种在地质时代相对较老的早三叠世中见到未成熟碳酸盐生油岩的情况,国内尚属首次发现,值得引起重视。本文主要应用烃类组成、岩石热解色谱、烷烃气相色谱、干酪根红外吸收光谱和镜质体反射率等分析成果,对未成熟碳酸盐生油岩的地球化学特征及其地质成因进行探讨。
In the Jurong Basin, Jiangsu Province, following the discovery of a self-generating low-medium maturity crude oil in the T_1x carbonate rock formation, immature carbonate sprouts were seen overlying the Qinglong Formation (T_1s) Oil rock. This situation of immature carbonate source rocks seen in the relatively early geological period of the Early Triassic is the first time it is discovered in China that it deserves our attention. In this paper, the geochemical characteristics of immature carbonate source rocks and their geological causes are discussed with the help of hydrocarbon composition, pyrolytic gas chromatography, alkane gas chromatography, kerogen infrared absorption spectroscopy and vitrinite reflectance .